JP3324355B2 - Operation abnormality monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation in which a local device monitors an abnormal operation of a central processing device between a dual system central processing device and a plurality of local processing devices connected via a transmission line. It relates to an abnormality monitoring system.

[0002]

2. Description of the Related Art FIG. 6 shows, for example, JP-A-64-89640.
FIG. 1 is a configuration diagram showing connections between processing devices of a conventional operation abnormality mutual monitoring system described in Japanese Unexamined Patent Publication (Kokai) Publication. In FIG.
101 is a central processing unit, and 102 is a remote processing unit. In the remote processing device 102, a central clock flag 112 and a remote clock flag 113 each having 1 bit are provided. The central clock flag 112 is periodically inverted by the flag inversion program 114 in the central processing unit 101 via the serial transmission line 103, and the remote clock flag 113 is controlled by the remote processing unit 102 The flag inversion control 115 periodically controls the inversion. Then, the content of the central clock flag 112 is monitored by the abnormality detection program 116 in the remote processing device 102, and based on the fact that the inversion operation has been stopped for a certain period of time, the central processing device 10
1 is recognized when an operation abnormality occurs, and the state of the remote clock flag 113 is monitored by the abnormality detection program 117 in the central processing unit 101 via the serial transmission line 103, and the inversion operation is stopped for a predetermined time. Based on this, it is recognized that an operation abnormality has occurred in the remote processing apparatus 102. In the operation abnormality mutual monitoring system configured as described above, the data transmission amount required for the operation abnormality detection requires two bits, and therefore, there is little hindrance to the original control data transmission.

[0003]

Since the conventional operation abnormality monitoring system is configured as described above, it has the following problems. Since the transmission signal for control and / or guarding of the guarded control equipment and the transmission signal for operation abnormality detection are transmitted through one serial transmission line, the frequency of occurrence of the transmission signal for operation abnormality detection Is increased, the transmission amount of a transmission signal for control or the like is restricted.
Further, if the frequency of occurrence of the transmission signal for detecting the operation abnormality is reduced, the time until the operation abnormality is detected becomes longer, and the real-time property cannot be realized in a system pursuing the real-time property. This is particularly noticeable when a plurality of local processing units are connected to the central processing unit. The present invention has been made in order to solve the above-described problems, and a plurality of local processing devices have an operating state of a central processing device that is a duplicated central processing device.
To provide an operation abnormality monitoring system capable of responding to an operation abnormality by satisfying a real-time property when an operation abnormality occurs, without restricting transmission of a transmission signal for control and / or guarding of a guarded facility. With the goal.

[0004]

An operation abnormality monitoring system according to the present invention includes a dual central processing unit having a secondary central processing unit and a main central processing unit having a signal generating means for outputting a transmittable signal when transmission is possible. A central processing unit, a first transmission unit connected to the central processing unit for transmitting a transmission signal, and a second transmission unit connected to the signal generation means and separate from the first transmission unit for transmitting a transmittable signal Monitoring means for inputting and outputting a transmission signal via a first transmission body, inputting a transmission possible signal via a second transmission body, and monitoring an abnormality of the main central processing unit based on the transmission possible signal it and a plurality of local processing unit having said transmittable signal constant peripheral
Signal whose amplitude changes during the period,
Indicates that the amplitude of the transmittable signal changes for a predetermined time or more.
It is configured to recognize an abnormality when not performed .

Further, the slave central processing unit is provided with monitoring means for inputting a transmittable signal via the second transmission body and monitoring the abnormality of the master central processing unit based on the transmittable signal. is there.

Further, a main central processing unit having first signal generation means for outputting a first transmission enable signal when transmission is possible, and a second central processing unit for outputting a second transmission enable signal when transmission is possible A dual central processing unit having a slave central processing unit having signal generating means, a first transmission body connected to the central processing unit for transmitting a transmission signal, and a first transmission unit connected to the first signal generating means. A second transmitter separate from the first transmitter for transmitting the transmittable signal of the third type, and a third transmitter separate from the first transmitter connected to the second signal generating means and transmitting the second transmittable signal. And a transmission signal through a first transmission body, and a first transmission possible signal via a second transmission body and a second transmission possible signal via a third transmission body. Based on the first and second transmittable signals, respectively, and It and a plurality of local processing unit having a monitoring means for monitoring the abnormality of the location, the transmission is possible
An active signal is a signal whose amplitude changes at a fixed cycle.
Ri, the above monitoring means the magnitude of the amplitude of the transmission enable signal
It is configured to recognize abnormality when it does not change for more than a predetermined time
In addition, the main central processing unit inputs a second transmittable signal via the third transmission body, and performs monitoring means for monitoring an abnormality of the slave central processing unit based on the second transmittable signal. And the slave central processing unit has the first transmission via the second transmission body.
And a monitoring means for monitoring the abnormality of the main central processing unit based on the first transmittable signal.

Further, when an abnormality of the main central processing unit is monitored, an error is displayed, and the local processing unit is configured to switch the input / output of the transmission signal from the main system to the subordinate central processing unit. It is.

The signal generating means modulates and outputs the digital signal, and the monitoring means demodulates the modulated signal.

[0009] The signal generating means is capable of transmitting when the operating state of the main central processing unit after the activation of the initial program and the operating state of the main central processing unit after the activation of the application program are normal. It is configured to output a recognized and transmittable signal.

Also, a dual-system central look-ahead processor provided with a master central look-ahead processor having a slave central look-ahead processor and signal generating means for outputting a transmittable signal when transmission is possible, A first transmission body connected to the main transmission and transmitting a status signal of the guarded facility; and a second transmission connected to the main central lookout processor and transmitting a transmittable signal and provided separately from the first transmission body. A monitor for outputting a status signal via a first transmitter and a status signal via a second transmitter, inputting a transmittable signal via a second transmitter, and monitoring an abnormality of the main central look-out processor based on the transmittable signal. And a facility lookout device having a means, wherein the transmittable signal is transmitted at a constant cycle.
A signal whose amplitude changes, and the monitoring means is
The amplitude of the transmittable signal does not change for a predetermined time or more.
It is configured to recognize Itoki abnormal, yet when an abnormality is monitored in the main system central Miha processing unit, facility Miha device is configured to switch the output of the state signal from the main system to the slave central Miha processing unit It is a thing.

Further, the facility lookout apparatus has a power supply charging means for receiving power supply according to the input transmittable signal.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the operation abnormality monitoring system. 1 is a main central processing unit, 2 is a slave central processing unit, and 3 (3a,..., 3n) are local processing units. The main central processing unit 1 and the local processing units 3a,..., 3n are connected by a transmission unit, that is, a main serial transmission line 4 and a transmission enable notification line 8, respectively. The slave central processing unit 2 and the local processing unit 3a are connected by the serial transmission line 5,
.., 3n are connected. The main central processing unit 1 includes an application processing unit 11 and a health check processing unit 12 for checking the health of the main serial transmission line 4, a main central processing unit 1 and a local processing unit 3a,. A transmission control unit 13 for performing serial transmission during the IPL (initial program load), that is, a procedure for loading a program for starting the operation of the OS from the auxiliary storage device by operating the console of the CPU and a procedure for loading various application programs A transmittable pulse generation circuit 1 that generates a transmittable pulse signal when the operating state of the main CPU 1 is normal.
5. Digital output unit 16 that outputs a transmittable pulse signal
It is composed of Then, the transmittable pulse generation circuit 1
5 and the digital output section 16 form a signal generating means for outputting a transmittable signal. Further, the slave central processing unit 2 has a transmission control unit. The local processing device 3a includes an application processing unit 31a, an application processing unit 31
a, a health check processing unit 32a for checking the health of the main serial transmission line 4, a transmission control unit 33a responsible for serial transmission between the main central processing unit 1 and the local processing units 3a,. Digital input unit 3 connected to enable notification line 8 and receiving a transmittable signal
4a, pulse monitoring circuit 36 in local processing device 3a
a, a transmission possibility determining unit 35a that determines whether transmission is possible based on an input signal from the pulse monitoring circuit 36a and a health check result of the health check processing unit 32a. The digital input unit 34a and the pulse monitoring circuit 36a constitute monitoring means for monitoring an abnormality of the main central processing unit 1. Further, similar to the local processing device 3a, other local processing devices (..., 3n) are also configured.

Next, the operation will be described. When the operation state of the various application processing units 11 becomes normal after the main central processing unit 1 has performed the IPL, a pulse signal is transmitted from the internal transmittable pulse generation circuit 15 to the transmittable notification line 8 at a constant period. Further, the local processing device 3a recognizes the pulse signal by the internal pulse monitoring circuit 36, and resets the internal monitoring counter according to the change timing of the pulse signal. During normal (normal) operation of the main central processing unit 1, each local processing unit 3a,.
The monitoring counter of the pulse monitoring circuit 36 within n is reset all at once in a fixed cycle, and transmission is performed using the main serial transmission line 4. When the main central processing unit 1 stops and when a failure occurs in all the main serial transmission lines 4, the transmission of the pulse signal from the transmittable pulse generation circuit stops. When the transmission of the pulse signal is stopped, the monitoring counter, which is the pulse monitoring circuit 36 in each of the local processors 3a,..., 3n, advances the count and becomes equal to a predetermined count value. The transmission processing with the central processing unit 1 can be immediately stopped, and the processing can be shifted to the transmission processing with the secondary central processing unit 2. That is, the local processing devices 3a,..., 3n normally perform transmission via the main central processing unit 1 and the main serial transmission line 4. When it is determined that transmission is not possible with respect to the slave 4, the transmission is performed with the slave central processing unit 2 using the slave serial transmission line 5.

The operation abnormality monitoring system according to the present embodiment includes a main serial transmission line 4 for controlling the guarded control equipment and / or for guarding, or for detecting an operation abnormality which is a communicable signal. Are transmitted via separate lines, that is, the communication enable notification line 8. Therefore, even if the frequency of occurrence of the transmittable signal for detecting the operation abnormality is increased, the transmission amount of the control signal and / or the watch signal of the guarded control equipment (not shown) is not restricted. . Further, a plurality of local processing units 3a,..., 3n are connected to the main central processing unit 1, and each of the local processing units 3a,.
A 3n pulse monitoring circuit 36 is provided, and when an abnormality occurs in the main central processing unit 1, the transmission enable signal is turned on.
F, a plurality of local processing devices 3a,..., 3n can cope with an abnormal operation of the main central processing device 1 at a time. Therefore, operation abnormality detection can be performed simultaneously in a short time, and a system that maintains real-time properties can be provided. In a system that requires real-time performance, these are not affected by prevention of a delay in detection of an operation abnormality in an operation abnormality monitoring system having a health check processing unit 32, prevention of erroneous detection by latching of a transmittable signal, and the like.

The operation abnormality monitoring system can be applied to a look-ahead control system or a computer system that performs look-out and / or control of a look-ahead facility such as a plant. Furthermore, as a local processing device,
A processing unit that directly obtains status signals from guarded facilities such as plants and outputs control signals to the guarded facilities, a front-end processor (front-end processor) connected between this processing unit and the central processing unit, etc. is there. That is, the central processing unit is a higher-level processing device, and the local processing device is a lower-level processing device. Furthermore, the transmittable signal is not a signal whose amplitude changes at a fixed cycle, and the transmittable signal generation circuit outputs a high-level signal when the operation state of the main central processing unit 1 is normal. Is also good. However, as described in the present embodiment, the transmittable signal is a pulse signal, that is, a type of signal whose amplitude changes at a constant cycle, and the pulse monitoring circuit 36 outputs a high level signal at a constant cycle. It is more preferable that the level and the low level be checked, and that the main central processing unit 1 be recognized as abnormal when the signal does not change for a predetermined time or more. That is, since the monitoring is performed by the pulse signal, an abnormality occurs in the main central processing unit 1 or the main serial transmission line 4, the transmission of the pulse signal is stopped, and the high level signal is temporarily stored in the register or the like of the digital output unit 16. This is because even if the signal is latched and a high level signal is constantly output, the abnormality of the main central processing unit 1 can be detected by the pulse monitoring circuit 36.

The transmittable pulse generation circuit 15
When the operation state of the main central processing unit 1 is normal after the PL and after the procedure of loading various application programs, a transmittable signal is generated, and a transmittable pulse signal is output from the digital output unit 16 to the transmittable notification line 8. The configuration to be performed has been described. However, the transmittable pulse generating circuit generates an IPL transmittable signal when the operation state of the post-IPL main processing unit 1 is normal, and operates the main processing unit 1 after the procedure of loading various application programs. When the state is normal, an application transmission enable signal is generated, and the IPL transmission enable signal and the application transmission enable signal are output from the digital output unit to separate transmission enable notification lines, and the local devices 3a,.
The configuration in which the operation state of the main central processing unit 1 is monitored by the transmission possibility determination unit in n may be adopted. Further, when an abnormality of the main central processing unit 1 is detected by the pulse monitoring circuit 36, an error may be displayed on, for example, a monitoring panel or a monitoring screen of a control center. At this time, the monitor can quickly respond to the abnormality of the central processing unit 1.

Embodiment 2 FIG. Another embodiment of the present invention will be described with reference to FIG.
FIG. 2 is a block diagram showing a configuration of the operation abnormality monitoring system. Reference numeral 28 denotes a digital input circuit provided in the slave central processing unit 2 and connected to the transmission enable notification line 8 to receive a transmission enable signal. 29 denotes a pulse monitoring circuit provided in the slave processing unit 2. The digital input unit 28 and the pulse monitoring circuit 29 constitute monitoring means for monitoring an abnormality of the main central processing unit 1. Other components are the same as in the first embodiment. In the first embodiment, the configuration has been described in which the main central processing unit 1 and the plurality of local processing units 3a,..., 3n are connected by the common transmission possible notification line 8. Here, in a system in which the slave central processing unit 2 needs to monitor the transmission possible state of the master central processing unit 1, the transmission possible notification line 8 is connected to the slave central processing unit 2, and the local processing unit 3a ,..., 3n, it is necessary to provide monitoring means comprising a digital input unit 28 and a pulse monitoring circuit 29. As described above, since the operation abnormality monitoring system is configured, it is not necessary to transfer an operation signal between the main central processing unit 1 and the sub central processing unit 2. Further, the slave central processing unit 2 can recognize the operation state of the master central processing unit 1 simply by connecting the digital input unit 28 and the pulse monitoring circuit 29 and connecting to the transmittable line 8, When an abnormal operation occurs in the apparatus 1, the apparatus 1 can be switched to the slave central processing apparatus 2 immediately.

Embodiment 3 Another embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a block diagram illustrating a configuration of the operation abnormality monitoring system. Reference numeral 6 denotes a transmission signal for controlling and / or guarding the guarded control equipment between the master and slave central processors 1 and 2 and the local processors 3a,..., 3n. The Ethernet LAN 9 is a slave central processing unit 2
, 3n, and a transmittable notification line for transmitting a transmittable pulse signal when the operation status of the subordinate central processing unit 2 is normal. Reference numeral 18 denotes the main central processing unit 1. A digital input circuit 19 connected to the transmission enable notification line 9 and receiving the transmission enable signal,
A pulse monitoring circuit provided in the main processing unit 1;
Is a transmittable pulse generation circuit that generates a transmittable pulse signal when the operation state of the slave central processing unit 2 is normal after the IPL and after the procedure for loading various application programs. It is a digital output unit that outputs the transmittable pulse signal output from the. The digital input unit 18 and the pulse monitoring circuit 19 form monitoring means for monitoring the abnormality of the slave central processing unit 2, and a transmittable pulse generating circuit 25 and a signal generating means for outputting a transmittable signal at the digital output unit 26. I do. Other components are the same as in the second embodiment.

In the second embodiment, the transmission enable signal of the master central processing unit 1 is notified to the slave central processing unit 2 and the local processing units 3a,. The operation state of the main central processing unit 1 was monitored. However, in a system in which the master central processing unit 1 and the slave central processing unit 2 need to always operate in parallel,
A transmission enable notification line 9 is added, and a transmission enable signal of the slave central processing unit 2 is notified to the master central processing unit 1 and the local processing units 3a,. It is necessary to monitor the operation state of the slave central processing unit 2. As described above, since the operation abnormality monitoring system is configured, the complex system operation management that always operates in parallel can be reduced to a small number of parts and a simple determination processing unit by mounting only the same two circuits as in the second embodiment. Can be realized.

Embodiment 4 Another embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a block diagram illustrating a configuration of the operation abnormality monitoring system. Reference numeral 10 denotes a carrier device that modulates a digital signal and outputs a carrier signal, and reference numerals 20 and 38a denote receiving devices that receive and demodulate the carrier signal. Other components are the same as those of the second embodiment.
Is the same as Then, the transport device 10 and the receiving device 38 are connected via the transmission possible notification line 8, and the transmission possible signal is transmitted as a pulse signal via the transmission possible notification line 8. Therefore, in particular, the operation state of the main central processing unit 1 can be monitored without providing a dedicated transmission line and a signal point amplification relay individually for the local processing devices 3a,. In addition,
Although a description has been given of the carrier device 10 that modulates a digital signal and outputs a carrier signal, the carrier device may be configured to output a carrier wave wirelessly and receive the carrier wave by a receiving device. In this case, the transmission possible notification line 8 connecting the main central processing unit 1 and the n local processing units 3a,..., 3n is unnecessary, and the connection configuration is simplified.

Embodiment 5 Another embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a block diagram illustrating a configuration of the operation abnormality monitoring system. Reference numeral 50 denotes a master central look-ahead processing device, reference numeral 60 denotes a slave central look-ahead processing device, and reference numerals 70a,... .., 70n by the main system connection cable 90 and the transmission enable notification line 80, and the facility center surveillance device 60a by the slave system connection cable 92. Device 7
, 70n are connected. The facility status signals output from the facility guards 70a,..., 70n are transmitted to the master central guard processor 50 via the master cable 90 or the slave center guard via the slave cable 92. The data is transmitted to the processing device 60. The main central lookout processing device 50 includes an application processing unit 52, a signal generating means for generating a transmittable pulse signal when the operation status of the main central lookout monitoring device 50 is normal, that is, a transmittable pulse generating circuit 56, Central lookout processing device 50 and equipment lookout device 7
.., 70n. A monitoring means for inputting a pulse signal transmitted through the transmission enable notification line 80 and monitoring the pulse signal, that is, a pulse monitoring circuit 64, the slave central look-ahead processing device 60 and the equipment The process input / output unit 62 is responsible for transmission among the guard devices 70a,..., 70n. The facility guard device (..., 70n) is configured similarly to the facility guard device 70a. The monitoring means for inputting the pulse signal transmitted through the transmission enable notification line 80 and monitoring the pulse signal, that is, the pulse monitoring circuit 76a, and the main system based on the output from the pulse monitoring circuit 76a. A connection switching circuit 74a for switching a connection destination between the connection cable 90 and the slave connection cable 92, a power supply charging means for charging power by a pulse signal and driving the connection switching circuit 74a with the charged power, that is, a driving power supply charging unit 78a. Is done.

Next, the operation will be described. The operation state of the main system monitoring processor 50 is monitored by monitoring means, that is, a pulse monitoring circuit 76. And the pulse monitoring circuit 7
6 checks the high level and the low level of the pulse signal at a fixed cycle, and recognizes an abnormality of the main central guard-processing device 50 when this signal does not change for a predetermined time or more. When an operation abnormality occurs, the connection switching circuit 74 simultaneously switches the connection destination from the master central lookout monitoring device 50 to the slave monitoring processing device 60. In addition, in a dual operation abnormality monitoring system,
Since the power is charged by the operation state signal from the upper-level central lookout processing device 50 and the connection switching circuit 74 that can be driven by this power is additionally configured, one circuit that conventionally outputs two kinds of various contact information is replaced by one system. Can be output. Further, the driving power supply for driving the connection switching circuit 74 can be charged and secured by the pulse signal from the transmission enable notification line 80. Therefore, there is no need to provide a dedicated power supply on the equipment guarding devices 70a,..., 70n, and the connection can be switched from the master central guarding device 50 to the slave central guarding device 60. Further, the facility lookout device 70
The H / W configuration of a,..., 70b can be simplified.

[0023]

As described above, according to the present invention, a dual central processing unit is provided which comprises a main central processing unit having a slave central processing unit and a signal generating means for outputting a transmittable signal when transmission is possible. A first transmitter connected to the central processing unit for transmitting a transmission signal; a second transmitter separate from the first transmitter for transmitting a transmittable signal connected to the signal generating means; Input and output the transmission signal through the transmission body of
A plurality of local processing devices having monitoring means for inputting a transmittable signal via the second transmission body and monitoring an abnormality of the main central processing unit based on the transmittable signal ,
The magnitude of the amplitude of the transmittable signal changes at a fixed cycle.
And the monitoring means controls the amplitude of the transmittable signal.
An error is recognized when the size of the object does not change for more than a predetermined time.
With such a configuration, the transmission amount of the transmission signal transmitted via the first transmission body is not restricted even if the transmission frequency of the transmittable signal for detecting the operation abnormality is increased.

Also, the slave central processing unit is provided with monitoring means for inputting a transmittable signal via the second transmission body and monitoring an abnormality of the master central processing unit based on the transmittable signal. It is not necessary to transfer an operation signal between the main processing unit and the slave processing unit, and it is possible to immediately switch to the slave processing unit when an operation abnormality occurs in the main processing unit.

A main central processing unit having first signal generation means for outputting a first transmission enable signal when transmission is possible, and a second central processing unit for outputting a second transmission enable signal when transmission is possible A dual central processing unit having a slave central processing unit having signal generating means, a first transmission body connected to the central processing unit for transmitting a transmission signal, and a first transmission unit connected to the first signal generating means. A second transmitter separate from the first transmitter for transmitting the transmittable signal of the third type, and a third transmitter separate from the first transmitter connected to the second signal generating means and transmitting the second transmittable signal. And a transmission signal through a first transmission body, and a first transmission possible signal via a second transmission body and a second transmission possible signal via a third transmission body. Based on the first and second transmittable signals, respectively, and It and a plurality of local processing unit having a monitoring means for monitoring the abnormality of the location, the transmission is possible
An active signal is a signal whose amplitude changes at a fixed cycle.
The monitoring means determines that the magnitude of the amplitude of the transmittable signal is
It is configured to recognize abnormality when it does not change for more than a predetermined time
In addition, the main central processing unit inputs a second transmittable signal via the third transmission body, and performs monitoring means for monitoring an abnormality of the slave central processing unit based on the second transmittable signal. And the slave central processing unit has the first transmission via the second transmission body.
And a monitoring means for monitoring the abnormality of the main central processing unit based on the first transmission enable signal, so that the operation abnormality monitoring of a complex system which always operates in parallel can be performed with a small number of parts. It can be realized by simple monitoring means.

Further, when an abnormality of the main central processing unit is monitored, an error is displayed and the local processing unit is configured to switch the input / output of the transmission signal from the main system to the subordinate central processing unit. Therefore, when an abnormality occurs in the main processing unit, by turning off the transmission enable signal, a plurality of local processing units can cope with the abnormality in the main processing unit at the same time. It is possible to provide a system that maintains the real-time property of recognizing all at once in a short time, and it is possible for the observer to quickly respond to abnormalities.

Also, the signal generating means modulates and outputs the digital signal, and the monitoring means demodulates the modulated signal. Therefore, a dedicated transmission line is individually provided to the local processing devices distributed over a wide area. Also, the operation state of the main processing unit can be monitored without providing a signal point amplification relay.

Further, the signal generating means can transmit when the operating state of the main central processing unit after starting the initial program and the operating state of the main central processing unit after starting the application program are normal. Since the configuration is such that the recognized and transmittable signal is output, the transmission signal is not transmitted until the application program starts normally, and a highly stable system can be supplied.

Also, a dual-system central look-ahead processor provided with a master central look-ahead processor having a slave central look-ahead processor and a signal generating means for outputting a transmittable signal when transmission is possible; A first transmission body connected to the main transmission and transmitting a status signal of the guarded facility; and a second transmission connected to the main central lookout processor and transmitting a transmittable signal and provided separately from the first transmission body. A monitor for outputting a status signal via a first transmitter and a status signal via a second transmitter, inputting a transmittable signal via a second transmitter, and monitoring an abnormality of the main central look-out processor based on the transmittable signal. And a facility lookout device having a means, wherein the transmittable signal is transmitted at a constant cycle.
A signal whose amplitude changes, and the monitoring means is
The amplitude of the transmittable signal does not change for a predetermined time or more.
When the abnormality of the master central lookout processing device is monitored, the facility guard device switches the output of the status signal from the main system to the slave central lookout processor. Therefore, even if the transmission frequency of the transmittable signal for detecting the operation abnormality is increased, the transmission amount of the state signal transmitted via the first transmission body is not restricted, and the transmission of the main signal from the main watch processing device is not restricted. The connection can be switched simultaneously to the slave look-ahead processing devices, and it is only necessary to output the status signal for one system.

Furthermore, since the facility guard is provided with a power supply charging means for receiving power supply from the input transmittable signal, there is no need to provide a dedicated power source on the facility guard, and the structure of the facility guard can be simplified. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an operation abnormality monitoring system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an operation abnormality monitoring system according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing an operation abnormality monitoring system according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing an operation abnormality monitoring system according to Embodiment 4 of the present invention.

FIG. 5 is a block diagram showing an operation abnormality monitoring system according to Embodiment 5 of the present invention.

FIG. 6 is a block diagram showing a conventional operation abnormality mutual monitoring system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main central processing unit, 10 transport unit, 15 transmittable pulse generation circuit, 16 digital output unit, 17 transmittable pulse generation circuit, 18 digital input unit, 19 pulse monitoring circuit, 2 slave central processing unit, 20 transport unit ,
25 transmittable pulse generation circuit, 26 digital output section, 27 pulse monitoring circuit, 28 digital input section, 2
9 pulse monitoring circuit, 3 local processing unit, 34 digital input section, 36 pulse monitoring circuit 4 main serial transmission line, 6 Ethernet RA
N, 8 transmission possible notification line, 9 transmission possible notification line 50 master central guard processing device, 56 transmittable pulse generating circuit 60 slave central guard processing device, 64 pulse monitoring circuit 70 equipment guarding device, 76 pulse monitoring circuit, 78 Driving power supply charging unit, 80 transmission possible notification line, 90 connection cable.

Continuation of the front page (56) References JP-A-3-288958 (JP, A) JP-A-4-305758 (JP, A) JP-A-63-78268 (JP, A) JP-A-4-367964 (JP) JP-A-7-219812 (JP, A) JP-A-56-19256 (JP, A) JP-A-63-296428 (JP, A) JP-A-61-129938 (JP, A) 62-224377 (JP, A) JP-A-3-6997 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04Q 9/00 G06F 11/16 H04L 29/14

Claims (8)

(57) [Claims] 1. A dual central processing unit, comprising: a main central processing unit having a slave central processing unit and a signal generating means for outputting a transmittable signal when transmission is possible; and a dual central processing unit connected to the central processing unit. A first transmitter that transmits a transmission signal, a second transmitter that is connected to the signal generating means and transmits the transmittable signal and is separate from the first transmitter, and via the first transmitter A plurality of monitoring means for inputting / outputting the transmission signal, inputting the transmission enable signal via the second transmission body, and monitoring an abnormality of the main central processing unit based on the transmission enable signal. A local processing device , wherein the transmittable signal changes in amplitude at a constant cycle.
And the monitoring means controls the amplitude of the transmittable signal.
An error is recognized when the size of the object does not change for more than a predetermined time.
An operation abnormality monitoring system characterized by being configured as described above . 2. The slave central processing unit includes a monitoring unit that inputs a transmittable signal via a second transmitter and monitors an abnormality of the master central processing unit based on the transmittable signal. The operation abnormality monitoring system according to claim 1, wherein: 3. A main central processing unit having first signal generation means for outputting a first transmission enable signal when transmission is possible, and a second central processing unit for outputting a second transmission enable signal when transmission is possible. A dual central processing unit provided with a slave central processing unit having signal generating means, a first transmission body connected to the central processing unit for transmitting a transmission signal, and connected to the first signal generating means; A second transmitter separate from the first transmitter for transmitting the first transmittable signal; and a first transmitter connected to the second signal generator and transmitting the second transmittable signal. A third transmitter separate from the transmitter, inputting and outputting the transmission signal via the first transmitter, the first transmittable signal and the third signal via the second transmitter; The second transmittable signal is input via a transmitter, and the first, Each the main system on the basis of the second transmission enable signal becomes a plurality of local processing unit having a monitoring means for monitoring the abnormality of the slave central processing unit, the transmission enable signal is the magnitude of the amplitude at a constant cycle Changes
And the monitoring means controls the amplitude of the transmittable signal.
An error is recognized when the size of the object does not change for more than a predetermined time.
And the master central processing unit receives the second transmittable signal via the third transmitter, and based on the second transmittable signal, the slave central processing unit Monitoring means for monitoring the abnormality of the above, the slave central processing unit inputs the first transmittable signal via the second transmitter, and based on the first transmittable signal, An operation abnormality monitoring system comprising monitoring means for monitoring an abnormality of a main central processing unit. 4. When the abnormality of the main central processing unit is monitored, an error is displayed and the local processing unit is configured to switch the input / output of the transmission signal from the main system to the subordinate central processing unit. The operation abnormality monitoring system according to claim 1, wherein: 5. The abnormal operation according to claim 1, wherein the signal generating means modulates and outputs the digital signal, and the monitoring means demodulates the modulated signal. Monitoring system. 6. The signal generating means is capable of transmitting data when the operation state of the main central processing unit after the activation of the initial program and the operation state of the main central processing unit after the activation of the application program are normal. The operation abnormality monitoring system according to any one of claims 1 to 5 , wherein the operation abnormality monitoring system is configured to output a transmission enable signal. 7. A dual-system central look-ahead processing device including a slave central look-ahead processing device and a main system central look-ahead processing device having a signal generating means for outputting a transmittable signal when transmission is possible; A first transmission body connected to the apparatus for transmitting a status signal of the guarded facility; and a first transmission body connected to the main central lookout processing device for transmitting the transmittable signal and being provided separately from the first transmission body. A second transmitter, outputting the status signal via the first transmitter, inputting the transmittable signal via the second transmitter, and controlling the main system based on the transmittable signal. and a facility Miha device having a monitoring means for monitoring the abnormality of central Miha processing unit
And the magnitude of the amplitude of the transmittable signal changes in a fixed cycle.
And the monitoring means controls the amplitude of the transmittable signal.
An error is recognized when the size of the object does not change for more than a predetermined time.
And when the abnormality of the master central lookout processing device is monitored, the facility lookout device is configured to switch the output of the status signal from the main system to the slave central lookout processing device. An operation abnormality monitoring system characterized by the following. 8. The operation abnormality monitoring system according to claim 7 , wherein the facility lookout device includes a power supply charging unit that receives power supply according to the input transmittable signal.